/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.naming;

import javax.naming.Context;
import javax.naming.Reference;

/**
 * Represents a reference address to a transaction.
 * 
 * @author Remy Maucherat
 * @version $Id: TransactionRef.java 939511 2010-04-29 23:48:20Z kkolinko $
 */

public class TransactionRef extends Reference {

	// -------------------------------------------------------------- Constants

	/**
	 * Default factory for this reference.
	 */
	public static final String DEFAULT_FACTORY = org.apache.naming.factory.Constants.DEFAULT_TRANSACTION_FACTORY;

	// ----------------------------------------------------------- Constructors

	/**
	 * Resource Reference.
	 */
	public TransactionRef() {
		this(null, null);
	}

	/**
	 * Resource Reference.
	 * 
	 * @param factory
	 *            The factory class
	 * @param factoryLocation
	 *            The factory location
	 */
	public TransactionRef(String factory, String factoryLocation) {
		super("javax.transaction.UserTransaction", factory, factoryLocation);
	}

	// ----------------------------------------------------- Instance Variables

	// ------------------------------------------------------ Reference Methods

	/**
	 * Retrieves the class name of the factory of the object to which this
	 * reference refers.
	 */
	public String getFactoryClassName() {
		String factory = super.getFactoryClassName();
		if (factory != null) {
			return factory;
		} else {
			factory = System.getProperty(Context.OBJECT_FACTORIES);
			if (factory != null) {
				return null;
			} else {
				return DEFAULT_FACTORY;
			}
		}
	}

	// ------------------------------------------------------------- Properties

}
